Hnub Kawg: 30 Cuaj hlis, 2024
(5) Tus neeg saib xyuas lub zog thaum ntxov thiab tus neeg saib xyuas lub zog thaum ntxov
Qee qhov ntxiv ncaj qha raws li cov hmoov qhuav, thaum lwm tus yuav tsum muab sib xyaw rau hauv cov kev daws teeb meem thiab siv raws li cov lus qhia rau kev siv. Yog hais tias nws yog tov nyob rau hauv daim ntawv ntawm cov hmoov qhuav, nws yuav tsum tau qhuav-siv nrog cement thiab aggregate ua ntej, ces ntxiv dej, thiab lub sij hawm sib tov yuav tsum tsis txhob tsawg tshaj li 3 feeb. Yog tias siv los ua kev daws teeb meem, dej kub ntawm 40-70 ° C tuaj yeem siv los ua kom nrawm nrawm. Tom qab pouring, nws yuav tsum tau them nrog yas zaj duab xis rau kho. Nyob rau hauv ib puag ncig uas tsis tshua muaj kub, nws yuav tsum tau them nrog cov khoom siv rwb thaiv tsev. Tom qab kev teeb tsa zaum kawg, nws yuav tsum tau watered thiab moisturized tam sim ntawd rau kev kho. Thaum lub tshuab tua hluav taws yog siv rau cov pob zeb sib xyaw nrog cov neeg sawv cev thaum ntxov, lub tshuab tua hluav taws xob yuav tsum tau txiav txim siab los ntawm kev sim.
(6) Antifreeze
Antifreeze muaj qhov ntsuas kub ntawm -5 ° C, -10 ° C, -15 ° C thiab lwm yam. Thaum siv nws, nws yuav tsum tau xaiv raws li qhov ntsuas kub txhua hnub. Cov pob zeb sib xyaw nrog cov tshuaj tua kab mob yuav tsum siv Portland MAAs lossis Portland MAAs zoo tib yam nrog qib siab tsis tsawg dua 42.5MPa. Kev siv siab alumina cement yog nruj me ntsis txwv. Chloride, nitrite thiab nitrate antifreezes yog nruj me ntsis txwv tsis pub siv nyob rau hauv prestressed pob zeb tej yaam num. Cov khoom siv pob zeb yuav tsum tau muab rhaub thiab siv, thiab qhov sib tov qhov hluav taws xob kub yuav tsum tsis txhob qis dua 10 ° C; tus nqi ntawm antifreeze thiab dej-cement piv yuav tsum nruj me ntsis tswj; lub sijhawm sib tov yuav tsum yog 50% ntev dua li qhov sib xyaw ua ke. Tom qab pouring, nws yuav tsum tau them nrog yas zaj duab xis thiab cov ntaub ntawv rwb thaiv tsev, thiab tsis muaj dej yuav tsum tau tso cai thaum lub sij hawm txij nkawm ntawm qhov kub tsis zoo.
(7) Extension agent
Ua ntej kev tsim kho, ib qho kev sim sib tov yuav tsum tau ua los txiav txim siab npaum li cas thiab xyuas kom meej qhov kev nthuav dav. Kev sib xyaw tshuab yuav tsum tau siv, lub sijhawm sib tov yuav tsum tsis pub tsawg dua 3 feeb, thiab lub sijhawm sib xyaw yuav tsum yog 30 vib nas this ntev dua li cov pob zeb tsis muaj cov khoom sib xyaw. Shrinkage-compensating qhob yuav tsum tau mechanically vibrated los xyuas kom meej compactness; mechanical vibration yuav tsum tsis txhob siv rau kev txhaws cov pob zeb ua ke nrog qhov poob siab tshaj 150mm. Cov pob zeb nthuav dav yuav tsum tau kho nyob rau hauv qhov chaw ntub dej ntau tshaj 14 hnub, thiab tom kawg yuav tsum tau kho los ntawm kev txau cov tshuaj tua kab mob.
(8) Accelerating tus neeg sawv cev
Thaum siv cov neeg ua haujlwm nrawm nrawm, yuav tsum tau them nyiaj rau qhov kev hloov pauv rau cov cement, thiab cov kev siv ntau npaum li cas thiab kev siv yuav tsum raug muab tso tseg. Yog hais tias cov ntsiab lus ntawm C3A thiab C3S nyob rau hauv cov cement yog siab, cov pob zeb sib tov ntawm accelerator yuav tsum tau nchuav los yog txau li ntawm 20 feeb. Tom qab lub pob zeb tsim, nws yuav tsum tau moisturized thiab tswj kom tsis txhob qhuav thiab tawg.
Post lub sij hawm: Oct-09-2024
